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Please read about SAFETY before you attempt to use the A-2000 25
ANNIVERSARY - we care about our customers and the equipment, and we
want you to enjoy this product for a long time!
INTRODUCING THE A-2000 25
STEREO POWER AMPLIFIER
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The A-2000 25
anniversary stereo power amplifier
is Allnic Audio's only KT150 stereo power amplifier
model. Like all Allnic Audio products, the A-2000
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25
anniversary has Permalloy (iron and nickel alloy)
for its transformer cores. Allnic is grateful to Mr.
G.W. Elmen of Western Electric for inventing
Permalloy for transformer core use, and in so doing,
providing an enormous service to recorded music
listeners everywhere.
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The 2000 25
anniversary has the following
features:
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100 watts of high power output. The A-2000
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25
anniversary is a push-pull, triode/pentode
switchable power amplifier.
Driving Circuitry. Allnic believes in the
importance of using high-quality, low noise
and powerful driving circuitry in all its
amplifying devices. Therefore, in the A-2000
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25
anniversary, we employ the E282F tube in
triode mode as the second stage driver tube,
with a load of about 5K ohms, and using 20mA
of current. The listener can easily hear and
even "feel" the differences between this
design and other, more conventional, ones.
Please imagine, as you listen to the A-2000 25
anniversary, its sound compared to the sound
of an amplifier with conventional 12AU7 or
12BH7's used as drivers, with a load of about
47K ohm, and using 2 to 3mA of current.
•
TH
ANNIVERSARY
Powerful
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•
"Full Engagement" Output Transformers.
Conventional output transformers use pre-set
secondary windings to accommodate 4, 8 and
16 ohm loudspeaker loads. However, these
conventional transformers utilize only one
secondary winding at a time, while the other
secondary windings remain "idle". This
approach has two adverse effects. First, the
output transformers are not working at their
maximum efficiency, reducing their output
relative to their potential. Second, the "idle"
windings are not actually "idle"; they are
subject to parasitic oscillations, producing
their own "signal". This undesirable electrical
information is additive to the transformer's
output, distorting the amplified signal going to
the loudspeaker. Allnic's "Full Engagement"
transformers address these issues by having 4
independent, secondary windings which are
always fully connected, never "idled". This
means that all secondary windings are always
connected to your loudspeakers, regardless of
which output switch position you use (4 ohms
or 8 ohms or 8 ohms or 16 ohms, depending
on the factory configuration you have
selected). The result is that there is neither a
loss of transformer output efficiency, nor the
introduction into the output signal of
distortion from parasitic oscillations of the
secondary windings.
Large Nickel/FeSi Core Output Transformers.
As with our other models, Allnic uses very
large output transformers (96 mm) with nickel,
3
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